Exhibit No. 11(a) COMPUTATION FOR BASIC EARNINGS PER SHARE FOR THE YEARS ENDED DECEMBER 31 (AMOUNTS IN MILLIONS EXCEPT FOR PER-SHARE DATA) 1999 1998 1997 ---- ---- ---- Basic Earnings (Loss) Per Share - ------------------------------- Net Earnings (loss) $14.3 $ (9.3) $185.0 ===== ====== ====== Average number of common shares outstanding 39.9 39.8 40.6 ----- ------ ------ Basic Earnings (Loss) per share $0.36 $(0.23) $ 4.55 ===== ====== ======